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兖州矿业(集团)公司济宁二号煤矿2304综放工作面轨道顺槽采用U形钢三心拱形支架支护。为解决回采时端头维护及替棚超前维护的难题,他们先在棚档里打锚杆固帮然后回棚,接着挂金属顶梁配合单体支柱支护。①预先在移动变电站外液压支架空档里打管缝式锚杆,配合钢筋梯对两肩窝向下部位进行主动维护,
Yanzhou Mining (Group) Company Jining No.2 Coal Mine 2304 fully mechanized caving track orbit using U-shaped steel arch support. In order to solve the problem of head maintenance and advanced maintenance for the roof during mining, they first bolt and then back to the shed in the shed stalls, and then hang the metal roof beam with the single strut support. ① pre-mobile substation outside the hydraulic bracket to play stitching anchor bolt, with the reinforced ladder on both sides of the shoulder to the lower part of active maintenance,